Add natural URL shortcuts for operators and language constructs (#767) (#1814)

Adds intuitive shortcut aliases like php.net/operator.precedence,
php.net/backtick.operator, php.net/string.type, php.net/statements,
etc. Supports both dot and hyphen separators for consistency.

Author: lacatoire

error.php

@@ -398,6 +398,38 @@
     "htaccess" => "configuration.changes",
     "php_value" => "configuration.changes",
 
+    "operator.precedence" => "language.operators.precedence",
+    "operator-precedence" => "language.operators.precedence",
+    "precedence" => "language.operators.precedence",
+    "arithmetic.operators" => "language.operators.arithmetic",
+    "arithmetic-operators" => "language.operators.arithmetic",
+    "assignment.operators" => "language.operators.assignment",
+    "assignment-operators" => "language.operators.assignment",
+    "bitwise.operators" => "language.operators.bitwise",
+    "bitwise-operators" => "language.operators.bitwise",
+    "comparison.operators" => "language.operators.comparison",
+    "comparison-operators" => "language.operators.comparison",
+    "error.control" => "language.operators.errorcontrol",
+    "error-control" => "language.operators.errorcontrol",
+    "backtick" => "language.operators.execution",
+    "backtick.operator" => "language.operators.execution",
+    "backtick-operator" => "language.operators.execution",
+    "execution.operator" => "language.operators.execution",
+    "increment.operators" => "language.operators.increment",
+    "increment-operators" => "language.operators.increment",
+    "logical.operators" => "language.operators.logical",
+    "logical-operators" => "language.operators.logical",
+    "string.operators" => "language.operators.string",
+    "string-operators" => "language.operators.string",
+    "type.operators" => "language.operators.type",
+    "type-operators" => "language.operators.type",
+    "string.type" => "language.types.string",
+    "array.type" => "language.types.array",
+    "object.type" => "language.types.object",
+    "statements" => "control-structures.intro",
+    "control.structures" => "control-structures.intro",
+    "control-structures" => "control-structures.intro",
+
     "ternary" => "language.operators.comparison",
     "instanceof" => "language.operators.type",
     "if" => "language.control-structures",